Andy Murray's title defence at the ATP Montreal Masters collapsed on Tuesday as the off-form Scot was crushed 6-3, 6-1 in his opening match by South African Kevin Anderson.

Andy Murray's title defence at the ATP Montreal Masters collapsed on Tuesday as the off-form Scot was crushed 6-3, 6-1 in his opening match by South African Kevin Anderson.

The two-time defending champion was bundled out in 69 minutes in his second-round start.

While Murray's Montreal campaign ended abruptly, top-seeded Novak Djokovic couldn't even get his going as rain rolled into the city in the early evening and eventually forced the postponement of Djokovic's scheduled second-round opener against Russian Nikolay Davydenko.

More poor weather was predicted for the area on Wednesday, when second seed Rafael Nadal and two-time Canadian winner Roger Federer are both due on court for their first matches in the US Open tuneup.

When he does get on court -- now scheduled for Wednesday -- Djokovic will be playing his first match as a reigning world number one.

He has ascended the rankings summit with a stellar season in which he boasts a 48-1 win-loss record with eight titles.

He and former top-five regular Davydenko have not played since 2009.

Djokovic won the Canadian trophy in 2007 and has never lost in Canada prior to the quarter-finals with a 12- record in the country.

Before the storms rolled in, Frenchman Richard Gasquet produced a repeat of his July Davis Cup victory over Florian Mayer as he defeated the German 6-3, 6-2.

A month ago, the 10th-seeded Gasquet won their Davis Cup encounter in Stuttgart after the 23rd-ranked Mayer served for the match at 5-4 in the fifth set.